Pinout
SpecificationsStorage temperature ...................55°C to +150°C
VCC with respect to AGND/DGND ....... 0.4 V to +7 V
VNEG with respect to AGND/DGND .....0.4 V to VBAT2
VBAT2 .................................................VBAT1 to GND
VBAT1 with respect to AGND/DGND:
Continuous.................................... +0.4 V to 80 V
10 ms.............................................+0.4 V to 85 V
BGND with respect to AGND/DGND..... +3 V to 3 V
A(TIP) or B(RING) to BGND:
Continuous ...............................VBAT1 5 V to +1 V
10 ms (f = 0.1 Hz) .............. ...VBAT1 10 V to +5 V
1 s (f = 0.1 Hz) ................... .VBAT1 15 V to +8 V
250 ns (f = 0.1 Hz) ................VBAT1 20 V to +12 V
Current from A(TIP) or B(RING)..................±150 mA
RYOUT1, RYOUT2 current................................75 mA
RYOUT1, RYOUT2 voltage ..................... RYE to +7 V
RYOUT1, RYOUT2 transient ................ RYE to +10 V
RYE voltage .....................................BGND to VBAT1
C3C1, D2D1, E1, B2EN, and RINGIN
Input voltage ........................0.4 V to VCC + 0.4 V
Maximum power dissipation, continuous,
TA = 70°C, No heat sink (See note):
In 32-pin PLCC package..............................1.67 W
Thermal Data:................................................... JA
In 32-pin PLCC package.......................45°C/W typ
Note: Thermal limiting circuitry on chip will shut down the ircuit at a junction temperature of about 165°C. The device hould never see this temperature and operation above 145°C unction temperature may degrade device reliability. See the LIC Packaging Considerations for more information.
Stresses above those listed under Absolute Maximum Ratings ay cause permanent device failure. Functionality at or above hese limits is not implied. Exposure to Absolute Maximum atings for extended periods may affect device reliabilityDescriptionThe AMD family of subscriber line interface circuit SLIC) products provide the telephone interface functions equired throughout the worldwide market. AMD LIC devices Am79R70 address all major telephony markets including entral office (CO), private branch exchange PBX), digital loop carrier (DLC), fiber-in-the-loop FITL), radio-in-the-loop (RITL), hybrid fiber coax HFC), and video telephony applications.
The AMD SLIC Am79R70 offer support of BORSHT (battery eed, overvoltage protection, ringing, supervision,hybrid, and test) functions with features including current imiting, on-hook transmission, polarity reversal, tipopen,and loop-current detection. These features allow eduction of linecard cost by minimizing component ount, conserving board space, and supporting automated anufacturing.
Am79R70 provide the two- to four-wire hybrid unction, DC loop feed, and two-wire supervision. wo-wire termination is programmed by a scaled impedance etwork. Transhybrid balance can be achieved with n external balance circuit or simply programmed using companion AMD codec device, the Am79C02/03/031 SLAC™ device, the Am79Q02/021/031 Programmable uad SLAC (QSLAC™) device, or the Am79Q5457/4457 onprogrammable QSLAC device.
The Am79R70 Ringing SLIC device is a bipolar monolithic LIC that offers on-chip ringing. Now designers an achieve significant cost reductions at the system evel for short-loop applications by integrating the ringing unction on chip. Examples of such applicationswould be ISDN Terminal Adaptors and set top boxes. sing a CMOS-compatible input waveform and wave haping R-C network, the Am79R70 Ringing SLIC can rovide trapezoidal wave ringing to meet various design equirements.
In order to further enhance the suitability of this device n short-loop, distributed switching applications, AMD as maximized power savings by incorporating battery witching on chip. The Am79R70 Ringing SLIC device witches between two battery supplies such that in the ff-hook (active) state, a low battery is used to save ower. In order to meet the Open Circuit voltage requirements f fax machines and maintenance termination nits (MTU), the SLIC automatically switches to a higher oltage in the On-hook (standby) state.
Like all of the AMD SLIC devices, the Am79R70 Ringing LIC device supports on-hook transmission, ring-tripdetection and programmable loop-detect threshold.The Am79R70 Ringing SLIC device is a programmable onstant-current feed device with two on-chip relay rivers to operate external relays. This unique device s available in the proven AMD 75 V bipolar process in 2-pin PLCC packages.
Am79R70 Data Sheet
